let age = 18
let a, b, c = 10, d = 'hello'

console.log(age)
console.log(age)
console.log(age)
console.log(age)
console.log(age)

console.log(a,b,c,d)
console.log(typeof(a),typeof(c),typeof(d)) //undefined number string

let name = '张三';
console.log('name',`学生：${name}`,name)



